Thank you for your reply.
The only contact address of the maintainer is
http://www-stat.stanford.edu/~tibs/SAM
However, one find no contact when one visit this page.
I am not a mathematician, therefore, it is strange for me to get probability
bigger that 1, if it is like that should I trust the p-value of 0.004332?
Sorry for these questions.
Best wishes,
Amor
--- Peter Dalgaard <p.dalga...@biostat.ku.dk> schrieb am Fr, 13.11.2009:
Von: Peter Dalgaard <p.dalga...@biostat.ku.dk>
Betreff: Re: [R] p-value > 1
An: "amor Gandhi" <amorigan...@yahoo.de>
CC: r-h...@stat.math.ethz.ch
Datum: Freitag, 13. November 2009, 15:24
amor Gandhi wrote:
> Dear all,
>
> I am trying to use SAMr-library(samr), it gives me p-value = 1.001, any idea
> why?
Well, the package maintainer might be a better place to ask. (Bring an example
if you do.)
However, as a generic matter, the result is obviously nonsensical, and could be
due to a sloppy approximation of a distribution function, or maybe it is a
(say) Bonferroni-adjusted p-value which is really an upper bound for the
correct p-value.
Notice, though, that you should only very rarely care about the exact p-value.
As soon as it is above 0.1, the message is just that you have not proven that
there is an effect.
-- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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